All of us here understand and would feel exactly as you do ... but I do know what you mean by feeling like crazy dog lady to some other people. My friends that own dogs understand more than anyone else the pain you feel when your dog is not 100%, more so than friends who own any other animal or have kids.
Do you work with anyone your age at work that you could get a drink/coffee after work or something? How about any dog lovers? I wish I were near you and could help you or just be a friend in the flesh. You sound so overwhelmed and lonely.
My heart is breaking for you and Layla.